QSC RMX 850 User manual

Features
• Professionalqualityperformance—incorporatesroad-provenQSCdesigns
• The4000wattRMX4050HDoperatesonastandard15ampplug(120V)
• BoththeRMX4050HDandRMX5050featureadualmono,highcurrent
powersupplyforincreasedreliabilityandperformance
• TheRMX1850HDandRMX4050HDprovideimprovedthermalperformance
yieldinghighercontinuouspowerin2ohmstereoor4ohmbridged
applications(aRMXHDexclusive!)
• Compactsize—upto2400wattsin2rackspacesor5000wattsin
3rackspaces
• High-currenttoroidaltransformersforgreater2ohmpowerandlownoise
• Independentuser-defeatablecliplimitersreducedistortion
• Selectablelowfrequencyfilters(30Hzor50Hz)protectspeakersand
increaseheadroom
• Balanced1/4"(6.3mm)TRS,XLR,andbarrierstripinputs
• Touch-proofbindingpostandNeutrikSpeakon®outputs
• Frontmountedgaincontrolsforeasyaccess
• SignalandClipLEDindicatorstomonitorperformance
• IndependentDCandthermaloverloadprotectiononeachchannel
automaticallyprotectsamplifierandspeakers
• 3yearwarrantyplusoptional3yearextendedservicecontract
The RMX Series amplifiers from QSC offer true professional-
quality performance at an affordable price. Four 2-rackspace
models range in power from 430 to 1200 watts per channel
at 2 ohms. Two 3-rackspace models provide 2000 to
2500 watts per channel at 2 ohms. All six models feature
a compact chassis less than 16" deep. RMX amplifiers
include a comprehensive set of features including XLR and
1/4" balanced inputs, Speakon®and binding post outposts
for convenient connectivity. User-defeatable clip limiters and
selectable low frequency filters optimize sonic performance.
RMX5050
QSC’s RMX5050 power amplifier represents state-of-the-art
in professional quality performance at an affordable price.
Perfectly suited for a wide range of sound reinforcement
applications including professional touring, performing
musicians, and mobile entertainers, the RMX5050 is optimized
to deliver high levels of sustained power, extraordinary audio
performance and road-proven reliability.
RMX4050HD
Like its smaller sibling (the RMX1850HD), the RMX4050HD
is one of two RMX “heavy duty” models designed to work
as hard into 2 ohm loads as most competing amplifiers will
at 4 ohms.
Both the RMX5050 and RMX4050HD feature a three-tier,
Class H design that is extremely efficient at real world power
levels. Less AC current is wasted and more available current
goes into producing useful audio power. 120 volt versions
of the RMX4050HD accomplish all this with a standard
15 amp plug.
RMX Series
RMX Power Amplifiers
Watts per channel
Model 8Ω 4Ω 2Ω* Bridged 4Ω*
RMX850 200 300 430 830
RMX1450 280 450 700 1400
RMX1850HD 360 600 900 1800
RMX2450 500 750 1200 2400
RMX4050HD 850 1400 2000 4000
RMX5050 1100 1800 2500 5000
1 kHz, 0.1% THD *1 kHz, 1% THD
ProfessionalPowerAmplifiers
RMX850 | RMX1450 | RMX1850HD | RMX2450 | RMX4050HD | RMX5050

RMX850 RMX1450 RMX1850HD RMX2450 RMX4050HD RMX5050
Stereo Mode (both channels driven) Continuous average output power per channel
8Ω/ FTC 20 Hz - 20 kHz / 0.1% THD 185 W 260 W 350 W 450 W 800 (650**) W 1050 W
8Ω/ EIA 1 kHz / 0.1% THD 200 W 280 W 360 W 500 W 850 W 1100 W
4Ω/ FTC 20 Hz - 20 kHz / 0.1% THD 280 W 400 W 550 W 650 W 1300 W 1600 W
4Ω/ EIA 1 kHz / 0.1% THD 300 W 450 W 600 W 750 W 1400 W 1800 W
2Ω/ FTC 20 Hz - 20 kHz / 1% THD − −−− 1600 W 2000 W
2Ω/ EIA 1 kHz / 1% THD 430 W 700 W 900 W 1200 W 2000 W 2500 W
Bridge Mono Mode Continuous average output power
8Ω/ FTC 20 Hz - 20 kHz / 0.1% THD 530 W800 W 1100 W 1300 W 2600 W 3200 W
8Ω/ EIA 1 kHz / 0.1% THD 600 W900 W 1200 W 1500 W 2800 W 3600 W
4Ω/ EIA 1 kHz / 1% THD 830 W 1400 W 1800 W 2400 W 4000 W 5000 W
Signal to Noise (20 Hz - 20 kHz) 8Ω> -100 dB > -100 dB > -100 dB > -100 dB > -100 dB > -100 dB
Distortion (SMPTE-IM) < 0.01% < 0.01% < 0.02% < 0.02% < 0.02% < 0.02%
Input Sensitivity at 8Ω1.15V (+3.4 dBu) 1.15V (+3.4 dBu) 1.16V (+3.5 dBu) 1.23V (+4.0 dBu) 1.25V (+4.1 dBu) 1.42V (+5.3 dBu)
Voltage Gain 31.6x (30 dB) 40x (32 dB) 46x (33 dB) 50x (34 dB) 64x (36 dB) 64x (36 dB)
Output Circuitry AB AB Class H, 2-tier Class H, 2-tier Class H, 3-tier Class H, 3-tier
Power Requirements
Typical, 1/8 power pink noise at 4Ω* 4.5 A 6.0 A 6.1 A 6.3 A 10.0 A 13.9 A
Severe, 1/3 power pink noise at 4Ω* 6.6 A 9.6 A 11.2 A 15.6 A 20.1 A 26.9 A
Supplied Plug Type, 100/120V NEMA 5-15 NEMA 5-15 NEMA 5-15 NEMA 5-15 NEMA 5-15 NEMA 5-20
Supplied Plug Type, 230V CEE7/7 CEE7/7 CEE7/7 CEE7/7 CEE7/7 CEE7/7
Weight
Net 35 lbs (15.9 kg) 40 lbs (18.2 kg) 44.5 lbs (20.2 kg) 44.5 lbs (20.2 kg) 68 lbs (30.8 kg) 75 lbs (33.1 kg)
Shipping 41 lbs (18.6 kg) 46 lbs (20.9 kg) 50.5 lbs (23 kg) 50.5 lbs (23 kg) 77 lbs (34.9 kg) 87 lbs (37.2 kg)
Distortion (typical)
20 Hz - 20 kHz: 10 dB below rated power < 0.03% THD / 4Ωand 8Ω< 0.02% THD / 4Ωand 8Ω
1.0 kHz and below: full rated power < 0.03% THD / 4Ωand 8Ω< 0.02% THD / 4Ωand 8Ω
Frequency Response 20 Hz - 20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bybassed / 8Ω)
Damping Factor (1 kHz and below) > 300 at 8Ω> 250 at 8Ω
Input Impedance 10k ohms unbalanced / 20k ohms balanced
Input Clipping 10 Vrms (+22 dBu) 6.4 Vrms (+18 dBu)
Cooling Continuously variable speed fan, back-to-front air flow
Connectors (each channel) Input: Active balanced / 3-pin Euro-style detachable terminal block and XLR (pin 2+)
Output: Touch-proof binding posts / Neutrik Speakon®
Controls Front: AC switch / Ch. 1 & 2 gain knobs
Rear: 10-position DIP switch
Indicators Power-on: Green LED / Signal: Yellow LED (1 per channel) / Clip: Red LED (1 per channel) Protect: Red LED
Amplifier Protection Full short circuit, open circuit, thermal, ultrasonic, RF protection. Stable into reactive or mismatched loads
Load Protection Turn-on/off muting / AC coupling (850, 1450) / Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
Dimensions 3.5" (8.9 cm) tall / 2 rack spaces 5.25" (13.3 cm) tall / 3 rack spaces
Power Requirements 100, 120, 230 VAC, 50 - 60 Hz (factory configured)
* at 120VAC, both channels driven; multiply current by .5 for 230V units
** CE Rating
RMX Series Specifications
qscaudio.com
Specifications subject to change without notice.
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: [phone]
RMX Spec Sheet 03/26/08
QSC and the QSC logo are registered trademarks of QSC Audio Products LLC in the U.S. Patent and Trademark office and other countries. Speakon is a trademark of Neutrik.
All other trademarks are the property of their respective owners. Patents may apply or be pending.